This Applet searches the DestinyTheGame and Fireteams Subreddits for potential Gorgon Chest giveaway posts.
Since there are quite a few boneheads who won't just say what they're doing, what system they're using, or which difficulty they're on, I didn't make the search as specific as it could be. As a result, there will be more than a few false positives.
The search string is simple enough that you shouldn't have any problems making it more specific once you've added it though. You will miss a few giveaways if you do, though. Enjoy.